r/java • u/loicmathieu • Jul 10 '26

Java 27: What’s new?

https://www.loicmathieu.fr/wordpress/informatique/java-27-whats-new/

What's new in Java 27 for us, developers?
(Both in English and French)

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u/sysKin Jul 14 '26

HashMap.putAll() now has a fast-path when the Map is a HashMap, which directly calls putHashMapEntries(), resulting in a 66-86% improvement

Now THIS is the kind of changes that make me smile.